Heat capacities of one-dimensional Heisenberg antiferromagnets under high magnetic fields

T. C. Kobayashi; A. Koda; H. Honda; C. U. Hong; K. Amaya; T. Asano; Y. Ajiro; M. Mekata; T. Yosida

doi:10.1016/0921-4526(94)00986-6

Heat capacities of one-dimensional Heisenberg antiferromagnets under high magnetic fields

T. C. Kobayashi, A. Koda, H. Honda, C. U. Hong, K. Amaya, T. Asano, Y. Ajiro, M. Mekata, T. Yosida

Research output: Contribution to journal › Article › peer-review

4 Citations (Scopus)

Abstract

Heat capacity measurements under magnetic fields are carried out on one-dimensional Heisenberg antiferromagnets, a spin-Peierls (SP) and Haldane gap system. In the SP system CuGeO₃, the jump in the heat capacity corresponding to SP transition is observed under fields up to 13 T. The obtained field-temperature phase diagram is in good agreement with the previous results of magnetic measurements. The heat capacity follows the exponential temperature dependence at low temperatures under zero field, while it approaches T³-dependence under external field. The heat capacity of Haldane gap system NINO is almost the same as that of NENP. The energy gap at and above H_c is caused by the existence of the transverse moment.

Original language	English
Pages (from-to)	205-207
Number of pages	3
Journal	Physica B: Physics of Condensed Matter
Volume	211
Issue number	1-4
DOIs	https://doi.org/10.1016/0921-4526(94)00986-6
Publication status	Published - May 1 1995
Externally published	Yes

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Electrical and Electronic Engineering

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title = "Heat capacities of one-dimensional Heisenberg antiferromagnets under high magnetic fields",

abstract = "Heat capacity measurements under magnetic fields are carried out on one-dimensional Heisenberg antiferromagnets, a spin-Peierls (SP) and Haldane gap system. In the SP system CuGeO3, the jump in the heat capacity corresponding to SP transition is observed under fields up to 13 T. The obtained field-temperature phase diagram is in good agreement with the previous results of magnetic measurements. The heat capacity follows the exponential temperature dependence at low temperatures under zero field, while it approaches T3-dependence under external field. The heat capacity of Haldane gap system NINO is almost the same as that of NENP. The energy gap at and above Hc is caused by the existence of the transverse moment.",

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T1 - Heat capacities of one-dimensional Heisenberg antiferromagnets under high magnetic fields

AU - Kobayashi, T. C.

AU - Koda, A.

AU - Honda, H.

AU - Hong, C. U.

AU - Amaya, K.

AU - Asano, T.

AU - Ajiro, Y.

AU - Mekata, M.

AU - Yosida, T.

PY - 1995/5/1

Y1 - 1995/5/1

N2 - Heat capacity measurements under magnetic fields are carried out on one-dimensional Heisenberg antiferromagnets, a spin-Peierls (SP) and Haldane gap system. In the SP system CuGeO3, the jump in the heat capacity corresponding to SP transition is observed under fields up to 13 T. The obtained field-temperature phase diagram is in good agreement with the previous results of magnetic measurements. The heat capacity follows the exponential temperature dependence at low temperatures under zero field, while it approaches T3-dependence under external field. The heat capacity of Haldane gap system NINO is almost the same as that of NENP. The energy gap at and above Hc is caused by the existence of the transverse moment.

AB - Heat capacity measurements under magnetic fields are carried out on one-dimensional Heisenberg antiferromagnets, a spin-Peierls (SP) and Haldane gap system. In the SP system CuGeO3, the jump in the heat capacity corresponding to SP transition is observed under fields up to 13 T. The obtained field-temperature phase diagram is in good agreement with the previous results of magnetic measurements. The heat capacity follows the exponential temperature dependence at low temperatures under zero field, while it approaches T3-dependence under external field. The heat capacity of Haldane gap system NINO is almost the same as that of NENP. The energy gap at and above Hc is caused by the existence of the transverse moment.

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Heat capacities of one-dimensional Heisenberg antiferromagnets under high magnetic fields

Abstract

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